#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<assert.h>

char* my_strncat(char* dest,const char* src, size_t num)
{
	assert(dest && src);
	char* ret = dest;
	while (*dest!='\0')
		dest++;
	while (num--)
	{
		*dest = *src;
		dest++;
		src++;
	}
	return ret;
}

int main()
{
	char arr1[20] = "hello ";
	char arr2[] = "world and people";
	char* ret=my_strncat(arr1, arr2, 5);
	printf("%s\n", ret);

	return 0;
}